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Metasurfaces have the potential to miniaturize and improve the performance ofany optical element, with applications spanning telecommunications, computingand wearable optics. However, the ability to retain functionality over acontinuous, broad range of wavelengths is essential for their widespreadadoption. So far, efforts to achieve this have been limited to either areflection configuration or operation at wavelengths other than the visible.Here, we show that by judicious choice of nanostructures, one can independentlycontrol both the phase and group delay, leading to broadband transmissiveachromatic metalenses and metalenses with tunable dispersion across the visiblespectrum. We demonstrate diffraction-limited broadband focusing and achromaticimaging using metalenses across wavelengths from 470 nm to 670 nm, with focallength change of a few percent across this 200 nm bandwidth. This approachrequires only a single layer metasurface whose thickness is on the wavelengthscale, and does not involve spatial multiplexing or cascading.

Phase and dispersion engineering of metalenses: broadband achromatic focusing and imaging in the visible